Bridge-gate



(No Model.) 2 Sheets-Sheet 1.

A.- JU NGMANN. BRIDGE GATE.

N0.50 1,947. PatentedJuIyZS, 1893.

A; JUNGMANN. BRIDGE GATE 2 Sheets-Sheet. 2.

(N9 Model.)

No. 501, 47. Patented Ju1 yi25, 189-3 UNITED STATES PATENT OFFICE.

AUGUST JUN GMANN, OF CHICAGO, ILLINOIS.

BRIDGE-GATE.

SPECIFICATION forming part of Letters Patent No. 501,947, dated July 25, 1893. Application filed May 31,1892. Serial No. 434.872. (No model.) I

To all whom it may concern:

Be it known that I, AUGUST J UNGMANN, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Bridge-Gates; and I do hereby declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a novel construction in bridge gates, the object being to provide a device of the character combining simplicity and durability of construction with efficiency of operation.

The invention consists in the features of construction and the combinations of parts hereinafter fully described and specifically claimed.

In the accompanying drawings illustrating my invention,Figure 1 is a side elevation for a portion of a bridge approach, or abutment, provided with a bridge gate constructed in accordance with my invention. In this figure certain parts are broken away for convenience of illustration and the bridge is shown as partly swung. Fig. 2 is a vertical cross section on the line 2-2 of Fig. 1. Fig. 3 is a plan View partly broken away. Fig. 4 is an end view of the bridge in detail.

Referring now to said drawings, Aindicates a bridge and B the bridge approach or abutment. Located upon the approach and on either side of the roadway are'two gate posts 1 that are provided on their adjacent faces with longitudinal guideways 2 in which a gate 0 is provided on its end with guides 3. The said gate 0 is raised and lowered by means of two cables, ropes, or strands 4 which are connected at one end with the ends of said gate and are then led upwardly and trained over pulleys 5 mounted at the upper end of the said posts 1, after which they are carried down along the other side of the posts and through a suitable opening in the bridge approach, and secured at the other ends to the pulleys mounted upon a shaft 7, which shaft is mounted in suitable bearings beneath the bridge approach. In this way it will be seen that the gate will stand normally in its lowered position as shown in Fig. 2, by reason of 7 its weight.

The devices for elevatingor lowering the gate, consist of a vibrating lever 8 that is pivoted at one end to the bridge approach B and extends outwardly toward the end of the approach and is connected near its outer end with a cable 9 that is trained over pulleys 10 on shafts 12 and is then connected with the drums 11 upon the shafts 7. Thesaid shafts 7 and the shafts 12 supporting pulleys 10 are mounted in suitable hearings on two upright frame pieces 13 located beneath the approach. The length of the cables 4 and 9 are so arranged with relation to the size of the winding pulleys 6 and drums 11, that when the gate is down the free end of the lever 8 will be elevated as shown in dotted lines in Fig. 1 and in full lines in Fig. 2, and. it will be noted that to elevate the gate it will be necessary to depress the outer end of the said vibrating lever 8, and to accomplish this operation the bridge is provided at its end, and beneath the same, with a cam surface 13 located to engage an anti-friction roller 14 on the end of said lever B. The highest point of said cam surface is located about the middle of the bridge, so that when the bridge is closed said cam surface will serve to depress the free end of the lever 8 to the lowest limit of its movement, which movement serves through the intermediacy of the cables 9 and 4 and the winding drum 11 and pulley 6 to elevate the gate, and it will be manifest that when the bridge is closed the gate will be held in its elevated position out of the roadway, but on the other hand, when the bridge swings in either direction the weight of the gate will serve to draw the same down, which movement will be gradual owing to the cam surface 13 over which the pulley 14 must pass as the bridge swings. It will be further noted, that in closing the bridge the inclined face of the cam surface will gradually depress the free end of the vibrating lever to elevate the gate in an obvious manner. The said vibrating lever 8 secured to the front frame piece 13, and'on both-sides of the slot 15 therein arethe longitudinal guide rails 16 between which is located an anti-friction roller 17 upon the-lever 8, and it will thus be seen that the said guide rails serve to limit the-movement of the lever in a strictly vertical direction, while at the same time the said anti-friction roller 17 serves to reduce the friction between the-le-Q ver and the said guide rails which would, in a construction of this kind, otherwise be con siderablepwing to the-side thruster; pressure imparted to the vibrating lever by the inclined face of the cam 13.

It will be seen from the foregoing descrip-' tion that I provideanovel bridgef'gatewhich comprises a few pa rtsgall 0f SlID-PI-WCOHSWUC- tion, which can be easily applied to a bridge, and further that the operation'bf-saidparts "being simple -it will be obvious' that the liability of-injury to the bridgegate, or of the failure of different parts to operate, will be reduced toa' minimum.

1 claim as my invention- A bridge gate comprising a gate located to slide in upright guideways, a vibrating lever 8, a cable 9 connected with said lever and trained over pulleys 10'and secured to winding drums 11, pulleys 6 secured to and turning with said winding drums, cables 4 connected with said pulleys 6 and trained over pulleys 5 on the upper end of gate posts 1 and 1 connectedwith the ends-of said gate, and a 

